Instrument of precision.



:.JAsGoTT.

INSTRUMENT 0F PRECISION. ABPLIOATION ITILBJJ APR; 2o, 1911.

` Patented Apr. 9,1912

NVENTOR.

y Logaeia STATES-PATENT. OFFICE.

JOHN .IAsGoT'n ori.` CHRISTOPHER, ILLINOIS.

Speaication of Letters Patent.-

INs'I-RUIIEN'f-r -or PRECISION.

Patented Apr. 9, 1912.

' Application led April-20,1911. Serial No. 622,253.

To all whom t may concern: l

Be it. known that I, JoHN JAsGo'r'r, a subject ofthe Czar of Russia, residing at Christopher, in the county of Franklin and State of Illinois, have invented certain new and useful Improvements In Instruments of ,L

Precision, ofwhich the` AEellowing is a specicationgfreference bei-ng had'thereinto the accompanying drawing.

This invention relates to an instrument of precision, and the object of the invention \is to provide an instrument that can be ad- `hvantageous1y fused by drat'tsmen,` machinists and other artisans for layingy otl' quadrants,

- segments, and arches and the instrument being somewhat similar to a protractor and can beulsed for the same purpose. I attain the above object by a mechanical construction that will be hereinafter speci cally described and then claimed, and reference will now be had to the drawing, wherein 4 Figure 1 is .a plan of the instrument. Fig. 2 is a side'elevation of the samepartly broken away and partly in section. Fig. 3 is an enlarged perspective view of a detached slide, Fignft is a plan of another form of instrument, and Fig. is a longi- 4 tudinal sectionalview of the same.

The reference numeral 1 denotes a vmetallic flat ri'nff having theinner walls thereof connectedhy a bar -2 and this bar intermediate the ends thereof is provided with a boss 3 having'af vertical openin 4. Pivotally mofnnted upon the boss 3 an retained thereon by a setscrcw 5 is a head 6 of an arm 7, said arm having a pointer 8 extending over the ring 1. Slidably mounted upon the arm 7 is a slide S) provided with a set screw 10 whereby it can beixed relativelyr shown especially designed for greater measurements.l The arm 7 is prolonged and the outer edge of the ring lis provided with. an extension l2 representing a continuation of the bar V2.

To use the device itis rplaced upon the material to be measured, the arm 7 is then adjusted to the proper angle the marking instrument inserted in the barrel 11, the arm 7 istheril'moved to the desired graduation. The element'2 is used as a rule and the same is-true of the arm 7. The device shown vas Fig. 4 is used for measuring larger pieces of material than that when the device shown in Fig. 1 is employed. .The element 12 is a, continuation of the rule for graduated bar 2. A 1

In Figs. 4 and 5 another instrument is The instrument canbe inade of metal or Celluloid. a l

' What I claim is:-

1. An instrument of precision, comprising 'a flat graduated ring, a graduated bar connecting,l the opposite inner edges of said ring positioned centrally with respect' to the ring, an extension carried by the outer edge of said ring and represent-ing a continuation of said bar, a boss carried by said bar inter- -mediate the ends thereof, a graduated arm v pi'votally mounted upon said boss fand adapted to swing over said ring, a sllde ad justably mounted upon said arm, vand a barrel carried by said slide, substantially as.

described.

ing a flat graduated ring, a graduated bar connecting the opposite inner edges of said ring and-positioned centrally with respect to the ring, a boss carried'by said bar centrally thereof, a graduated arm pivotall;7` mounted upon said boss and ca able of swinging over. said ring, a 'slide a justably mounted upon said arm, and a barrel carricd by said slide. u

In testimony whereof I atiix my signature in the presence of two witnesses.

' JOHN JAseo'rr.'

Witnesses: I

WM. KIsELL, .,l; W. Pnrnorr.

2. An instrument of precision compris- 

